i use 1 2 3 for my lava burst lightning and chain 4 5 6 is lesser, healing wave, and chain assist target and then i use number pad to single target my shamans 1 - 4 . 5 chains a group member and 6 is stopcasting 4x lesser healign wave on tank in case i need the burst heal real quick. its worked so far for me and ive been doing quite a few heroics.